Ashesh Sharma
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View article: AMR‐Wind: A Performance‐Portable, High‐Fidelity Flow Solver for Wind Farm Simulations
AMR‐Wind: A Performance‐Portable, High‐Fidelity Flow Solver for Wind Farm Simulations Open
We present AMR‐Wind, a verified and validated high‐fidelity computational‐fluid‐dynamics code for wind farm flows. AMR‐Wind is a block‐structured, adaptive‐mesh, incompressible‐flow solver that enables predictive simulations of the atmosph…
View article: Improved pressure-gradient sensor for the prediction of separation onset in RANS models
Improved pressure-gradient sensor for the prediction of separation onset in RANS models Open
Here, we improve upon two key aspects of the Menter shear stress transport (SST) turbulence model: (1) We propose a more robust adverse pressure gradient sensor based on the strength of the pressure gradient in the direction of the local m…
View article: Improved pressure-gradient sensor for the prediction of separation onset in RANS models
Improved pressure-gradient sensor for the prediction of separation onset in RANS models Open
We improve upon two key aspects of the Menter shear stress transport (SST) turbulence model: (1) We propose a more robust adverse pressure gradient sensor based on the strength of the pressure gradient in the direction of the local mean fl…
View article: ExaWind: Open‐source CFD for hybrid‐RANS/LES geometry‐resolved wind turbine simulations in atmospheric flows
ExaWind: Open‐source CFD for hybrid‐RANS/LES geometry‐resolved wind turbine simulations in atmospheric flows Open
Predictive high‐fidelity modeling of wind turbines with computational fluid dynamics, wherein turbine geometry is resolved in an atmospheric boundary layer, is important to understanding complex flow accounting for design strategies and op…
View article: ExaWind at NREL: Upping the Ante
ExaWind at NREL: Upping the Ante Open
The objective of the ExaWind component of the Exascale Computing Project is to deliver many-turbine blade-resolved simulations in complex terrain. These simulations bring new challenges to both compute and analysis of the resulting data. I…
View article: Assessing the Optical Performance Impact of Tracking Error in an Operational Concentrated Solar Power Plant Using Monte Carlo Ray-Tracing Simulation
Assessing the Optical Performance Impact of Tracking Error in an Operational Concentrated Solar Power Plant Using Monte Carlo Ray-Tracing Simulation Open
Concentrating Solar Power (CSP) provides firm and dispatchable electricity due to its thermal storage and hybridization capabilities, which supports the decarbonization of our energy supply. Of the various CSP technologies, parabolic troug…
View article: The Impacts of Developing a Port Network for Floating Offshore Wind Energy on the West Coast of the United States
The Impacts of Developing a Port Network for Floating Offshore Wind Energy on the West Coast of the United States Open
Floating offshore wind is a pre-commercial industry with the potential for significant market growth on the U.S. West Coast in the near future; however, significant investment in port infrastructure will be required to enable the industry …
View article: Mesh and model requirements for capturing deep-stall aerodynamics in low-Mach-number flows
Mesh and model requirements for capturing deep-stall aerodynamics in low-Mach-number flows Open
Here, this work presents a comprehensive computational fluid dynamics investigation of the effects of grid resolution and turbulence-model choice for capturing the unsteady three-dimensional aerodynamic performance of NACA 0012 and 0021 ai…
View article: ExaWind: Then and Now
ExaWind: Then and Now Open
The scientific goal of the ExaWind project is to advance our fundamental understanding of the flow physics governing whole wind plant performance, including wake formation, complex terrain impacts, and turbine-turbine-interaction effects. …
View article: Demonstrate multi-turbine simulation with hybrid-structured / unstructured-moving-grid software stack running primarily on GPUs and propose improvements for successful KPP-2
Demonstrate multi-turbine simulation with hybrid-structured / unstructured-moving-grid software stack running primarily on GPUs and propose improvements for successful KPP-2 Open
The goal of the ExaWind project is to enable predictive simulations of wind farms comprised of many megawatt-scale turbines situated in complex terrain. Predictive simulations will require computational fluid dynamics (CFD) simulations for…
View article: Preparing an incompressible-flow fluid dynamics code for exascale-class wind energy simulations
Preparing an incompressible-flow fluid dynamics code for exascale-class wind energy simulations Open
The U.S. Department of Energy has identified exascale-class wind farm simulation as critical to wind energy scientific discovery. A primary objective of the ExaWind project is to build high-performance, predictive computational fluid dynam…
View article: Preparing an Incompressible-Flow Fluid Dynamics Code for Exascale-Class Wind Energy Simulations.
Preparing an Incompressible-Flow Fluid Dynamics Code for Exascale-Class Wind Energy Simulations. Open
latest generation GPU devices to get high-performance. The result of our efforts are unstructured mesh simulations of wind turbines that use 1/6 the compute resources of Summit supercomputer at Oak Ridge National Lab. In particular, we dem…
View article: FY2021 Q4: Demonstrate moving-grid multi-turbine simulations primarily run on GPUs and propose improvements for successful KPP-2 [Slides]
FY2021 Q4: Demonstrate moving-grid multi-turbine simulations primarily run on GPUs and propose improvements for successful KPP-2 [Slides] Open
Isocontours of Q-criterion with velocity visualized in the wake for two NREL 5-MW turbines operating under uniform-inflow wind speed of 8 m/s. Simulation performed with the hybrid-Nalu-Wind/AMR-Wind solver.
View article: Demonstrate moving-grid multi-turbine simulations primarily run on GPUs and propose improvements for successful KPP-2
Demonstrate moving-grid multi-turbine simulations primarily run on GPUs and propose improvements for successful KPP-2 Open
The goal of the ExaWind project is to enable predictive simulations of wind farms comprised of many megawatt-scale turbines situated in complex terrain. Predictive simulations will require computational fluid dynamics (CFD) simulations for…
View article: ExaWind: Exascale Predictive Wind Plant Flow Physics Modeling.
ExaWind: Exascale Predictive Wind Plant Flow Physics Modeling. Open
The scientific goal of the ExaWind project is to advance our fundamental understanding of the flow physics governing whole wind plant performance, including wake formation, complex terrain impacts, and turbine-turbine-interaction effects. …
View article: Nalu-Wind and OpenFAST: A high-fidelity modeling and simulation environment for wind energy. Milestone ECP-Q2-FY19
Nalu-Wind and OpenFAST: A high-fidelity modeling and simulation environment for wind energy. Milestone ECP-Q2-FY19 Open
The goal of the ExaWind project is to enable predictive simulations of wind farms comprised of many megawatt-scale turbines situated in complex terrain. Predictive simulations will require computational fluid dynamics (CFD) simulations for…
View article: Advances in Design and Optimization Using Immersed Boundary Methods
Advances in Design and Optimization Using Immersed Boundary Methods Open
This thesis is concerned with topology optimization which provides engineers with a systematic approach to optimize the layout and geometry of a structure against various design criteria. Traditional topology optimization uses density-base…